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Originally Posted by gregbradley
That is an amazing repair of those stars. Really excellent.
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Thanks Greg! I'm pretty happy with that result too.
I've been meaning to add this module for so long as it's one of the first I wrote along with StarWipe.
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Originally Posted by gregbradley
But of course one problem with that is that the actual image will be smeared as well as the stars.
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The Repair module certainly works when you have tracking issues (like in the example before & after) but indeed doesn't correct the rest of the image.
However, if all you have is a distortion in your image (i.e. subtle field warping but no blur), then the Repair module makes your stars look correct. No one will notice that the rest of the image is slightly warped, but everyone will notice that your stars aren't round as they are often the only geometrically perfect objects in your image.
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Does it correct for that or is that not feasible?
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The only proper way to correct smearing due to tracking issues is to use some sort of deconvolution.
However, decon only works reliably when your field is perfectly flat and the image is uniformly convoluted by the same point spread function throughout the whole image (for example when you have tracking issues). Sadly, localised lens and mirror aberrations (coma, chromatic aberration, etc.) often mess this up making stars appear different throughout the image, making it impossible to apply just a single corrective PSF.
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As you say your result is far superior to the darken layer/offset tool technique.
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Like decon, the offset filter technique also has the problem that it is applied uniformly to the image (e.g. the whole image is corrected by the same amount). You'll have no luck applying this old favorite to a full image that suffers from any form of distortion. I have seen people apply it selectively to different parts of the image though as a workaround.
